Shock absorber



Patented Dec. 15, 1931 UNITED STAT S P TEN (OF ICE? WILLIAM ncnnvsnor DAYTON, OHIO, Assrenoitro nELco PRODUCTS coarorwrion;

j on DAYTON, omo, A CORPORATION or DELAWARE SHOCK ABSORBER h Application filed. August 30, 1929. Serial No: 389.538.

. This invention relates. to improvements in hydraulic shock absorbers adapted to control the i'eboundingaction of vehicle springs, T

I i It is among the'objects ofthe present invention to providea shock absorber of simplestructure and design adapted to be produced commercially at a minimum cost of time and material.

Another object of the present invention is to provide a hydraulic shock absorber with avalve supported so that it will be selfaligning and that (sticking thereof will be substantially eliminated. Y 4

Further objects and "advantages of the present invention will be apparent from the following description, reference being had to the accompanyingdrawings, where in a preferredembodiment of one formof the T present invention is clearly shown.

0 In the drawings: I

Fig. --1 is 'a fragmentary side view of the chassis of'a motor vehicle having a shock absorber embodying the present invention attachedther'eto. 1 I

3 "aFig.j2 is, a longitudinal sectional view taken through the shock absorber. I

ig. 3. is a fragmentary detail sectional view taken along the line.3-3 of Fig. 2.

4 Figs. 4 and 5 are detail views showing 30 portions'ofthe valveassembly I I Referringto theidrawings, the numeral designates the frame of the vehiclewhich is supportedupon. the vehicle .1 axle 21 by springs 22, only one of which is; shown.

as 1 The "shock absorber'coniprisesfa'casing 23 presenting a fluid r'eservoir24 and a cylinder25. "Theiopen end of thecasing 23 "is sealed by the'cover 26 secured to the casing I by screws 27.1'Theshock absorber casing is 0 attached to the frame 20in. any suitable manner.

Bearing surfaces provided .111 'the casing '23 rotatably support the rocker shaft 30, oneend oIfwliich extends tothe outside'of chored to the axle 21 by clamping member I plug 61, which seals this opening. Screw the casing 23 and -hasthe-shock absorber- 34. Within the casing 23 and mount'ed upon the shaft 30 there is a rocker arm r secured tothe shaft by thelset'screw 3 6." The free I end of the rocker arm 35 engages with a I wearpiece 373inserted in the head 38 of the 55 piston 39. Piston 39,; is reciprocably v sup ported within thejcylinder 25, a spring 40, interposedbetween the piston and the bottom end wall of the cylinder 25, urging the piston sothat itswear piece 37 is substantiaL 1y infcon s tantj engagementwith the freeend of the rocker I arm 35.

lnthe piston head hereiis provided apassage 41 through which fluid may flow from, the fluid reservoir 24 intothe cy1inder25 ,Ias will be described. Around the annular'opening42 of passage 41 there is formed arldge 43 providing a valve-seat on the inner surface of the piston head. A retainin -mem- I her or cup 44, has an outwardly exten ing annular flange 45, which is engaged by spring and is maintained against the inner piston head surface.' Retainer cup or member 44" has an opening substantially coaxialof thecylinder 25, said opening having aniannularflange 47. A disc valve-48 has a central annular extension 49. Theconvolutions atone end of the spring fit; grippingly about the central extension 49 of the valve 48, the convolutions at the other end of the 80 spring fitting tightly about the annular flange v 47 of'the' retaining member Valve is thus supported upon. the "retainer cup or member 44 in {awobbly manner, that is, itis not supported upon any stationary member,

but upon theflexible spring which is carried by the retaining cup or member 44, whereby said valve will be self-aligning when'it is urgedintoengagementwith the valve seat 43 bythe spring 50L I In .th casi g there is provided an aperture screw-threaded for receiving the screw plug 61 carries a valve pin 62 which extends a into the port 63 in] the cylinder wall and.

which provides communication between the A fluidireservoir 24 and] the cylinder 25; valve 64 slidablyfSupportrd upon the pin 62 and is urged intoengagem'entwith'the a partition 65 to close theport 63 by aspring 66 I 0 rise 31 v other for s surrounding pin 62 and interposed between the valve and the screw plug 61.

lVhen the road wheels of the vehicle, not shown, but mounted upon the axle 21, strike an obstruction in the roadway, springs 22 will be flexed, moving upwardly toward the frame 20, thus 'causingcountenclockwise rotation of the armfin andits'shaft and thus moving the rocker arm away from the piston Spr ng-e hQWWQ B l c u e t e pi aria i'ollow the upward'moveiiient ti the free end of rocker attested thus'fliiid within the fluid reservoir 34, exerting pressure upon the valve 48, will cause said valve to be moved from the valve; seat 4?; against the effect of spring and thus aflow of fluid established froriith'e 'i'servoiif through the pas 4 Pas h' alt into e @3 1 Ret rn movement 9 the prin war u'ilfl lei l' bilfieil will, f ib; an l d bee amend ng i i re,v resu t ng i und si a le ia 's' a' id iQ if ran mitted t lthefiafiie or the h i e t id t i th pr set dens y s h 5 Yem n i he SP i g a 1t unflexea-i As the rings 22 move toward normal anties, tlie hnkconnecti'in 32 will rocker: farm 5 eq ientlythe Shaft i'm i me of the a piessure I 1 1 9 1Z'-i'-l it P the P st a s g t t be mov d d nsexiest 11pm. t e ii t ce th p ten l 'viaeaiin the pistes s bs-ant lea a e this tbint 'sai b inj au j ar$ pr er t t mpmp'e li' n ar rreri l sia W bb y on 3: Pi l, thus gti k v lv than the. v lv s 'l/Vhile the'forin of'embodimentof thepresent inventi n, s erein di' e. const tu apr ieriedrfent ijf i ,e ndrs od s it b dopted; ll f 9i l met le q aims r th; fol;-

d; s. a te ers rber a cpmpr n combi- Jfor'operating, the piston through its suction a fffi ll. seat ng 6f the ea s itbs ai tia y as.-

transfer of fluid from one side of the piston to the other as said piston moves through its suction stroke; a valve cage maintained upon the piston by the piston operating means; a spriug'securedat one end to the valve'oage; and valve solelyfs upported upon the'spring to which it is attached, said spring normally urging, said valve to close the piston passa e.

'rb'er comprising in com ination, sensing presenting a fluid reservoir and a cylinder; a piston in the cylinder'forming a compression chamber therein; means stroke; a passage in the piston providing for'the transfer of fluid from one side of the piston to the other "said piston is moved thrdiighits suction stroke ;'a disc valve having 7 a central protub'erai'ice a valve cage having a central angesubstantially coaxial of the protuberance; of the disc-valve, said valve cage 'b'ein'g' inaiiitained'up'on the piston by the said piston operating means"; and a' spring secured at one end to the valve'protuberance and at the other end tothe valve-cage flange, said spring providing thesole support of the value and urging the valve to close the passageinthepiston. i 3. A shock absorber comprising in conibination, a casing presenting'a fluid reservoir and acylinde'r ;"a piston in the cylinder forming'a compression chamber therein, said pis ton havi" a head portion provided with a passage ifiierethrough; an annular ridge 19 about said passage providing a valve seat; 1" lever's' for operating the piston in one direction"; a'sp'ring for operating the piston in the other direction; a disc-valve having a central, annular extension away from the valve seat; 19

retainer cupmaintained upon the piston by the pistonop'e'rating spring,"s aid retainer cup having an annulanflang'e "extending toward the ruse-valve; a spring havingthe convolutions'a'djaceiit -'one end grippingly fitting 1 10 about the annularfextension on the disc-valve m the convolutions' adj acent the other end 'gi 'ippingly'fitting about-the annular flange Hon theretailierfc'up'and urging the valve upon the valve seat.

"hockabsorber comprising in combination, a casing presenting a fluidreservoi'r and a cylinder; a piston in the cylinder formi ngia; compressionchamber therein, said'piston having ahead portion provided with a passage therethrough; an integral annular ridge on the piston, about said passagepro-v vidi'ng a valve seat; levers for operatingthe piston 1n one direction; a spring for operatin'gth'e piston in the other direction; a disc- 1,25

' valve; a retainer cup maintained upon the piston by its operating spring; and resilient v means anchored at one end to the retainer cup,

and at the other end to the disc valve so as to'js ecur e valve and valve cage together 1,30

as a unitary structure, said spring yieldably supporting the valve within the valve cage and urging it into engagement with the valve seat.

In testimony whereof I hereto aflix my signature.

WILLIAM A. :CHRYST. 

